73421 has 2 divisors, whose sum is σ = 73422. Its totient is φ = 73420.

The previous prime is 73417. The next prime is 73433. The reversal of 73421 is 12437.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44521 + 28900 = 211^2 + 170^2 .

It is an emirp because it is prime and its reverse (12437) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73421 - 2² = 73417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 73421.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 73421.

It is not a weakly prime, because it can be changed into another prime (73471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36710 + 36711.

It is an arithmetic number, because the mean of its divisors is an integer number (36711).

2⁷³⁴²¹ is an apocalyptic number.

It is an amenable number.

73421 is a deficient number, since it is larger than the sum of its proper divisors (1).

73421 is an equidigital number, since it uses as much as digits as its factorization.

73421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168, while the sum is 17.

The square root of 73421 is about 270.9630971184. The cubic root of 73421 is about 41.8735805563.

Adding to 73421 its reverse (12437), we get a palindrome (85858).

It can be divided in two parts, 73 and 421, that added together give a palindrome (494).

The spelling of 73421 in words is "seventy-three thousand, four hundred twenty-one", and thus it is an iban number.